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DMD42850
Specifications and Applications
Information
Four Lamp
DC to AC Inverter
03/02/11
Package Configuration
1.03 [26,2]
MAX
Output
(4x)
1
1
J2
Powered by a regulated +12 Volt DC source, the
DMD42850 is designed to power the backlight of
the Sharp LQ150X1LW71 display.
.809 [20,54]
J3
.160 [4,0]
Dia. (2x)
6.69
[169,9]
MAX
Product Features
Input
J1
1
 Small Package Size, less than 13mm in height
5.012
[127,30]
 High Dimming Ratio
 High Efficiency
 Made in U.S.A.
J4
J5
1
1
PCB components are shown for reference only. Actual product may differ from that shown.
The ERG DMD42850 (DMD
Series) DC to AC inverter
DMD Series
features onboard connectors and can be easily dimmed
using the onboard PWM Dimming or an external PWM
generator.
.24 [6,1]
.555 [14,09]
Mass: 45 grams
Pin Descriptions
DMD Package
PCB components are shown for reference only.
Actual product may differ from that shown.
J4-1 ACout
J4-2 ACreturn
Connectors
Output (4x)
JST
SM02B-BHSS-1-TB
J2-1 ACout
J2-2 ACreturn
Input
Molex
53261-0871
J1-1
J1-2
J1-3
J1-4
J1-5
J1-6
J1-7
J1-8
+Vin
+Vin
GND
GND
Enable
Control
GND
GND
J3-1 ACout
J3-2 ACreturn
J5-1 ACout
J5-2 ACreturn
page 1.
DMD42850
Absolute Maximum Ratings
Rating
Symbol
Value
Units
Input Voltage Range
V in
-0.3 to +13.2
V dc
Storage Temperature
T stg
-40 to +85
o
C
Operating Characteristics
With a load simulating the referenced display and lamp warm-up of 5 minutes.
Unless otherwise noted Vin = 12.00 Volts dc and Ta = 25oC.
Characteristic
Symbol
Min
Typ
Max
Units
Input Voltage
V in
+10.8
+12.0
+12.6
V dc
Component Surface (note 1)
Temperature
Ts
-20
-
+80
Input Current (note 2)
I in
-
1.62
1.90
A dc
Input Ripple Current
I rip
-
20
-
mA pk-pk
Fo
34
39
44
kHz
V out (min)
1500
-
-
Vrms
h
-
82
-
%
Output Current (per lamp)
I out
-
6.5
-
mArms
Output Voltage
Vout
-
615
-
Vrms
Turn-off Threshold
V thoff
GND
-
0.5
V dc
Turn-on Threshold
V thon
2.0
-
Vi n
V dc
Impedance to Vin
R Enable
-
10
-
kOhms
Operating Frequency
Minimum Output Voltage (note 3)
Efficiency
o
C
Enable Pin
Specifications subject to change without notice.
(Note 1) Surface temperature must not exceed 80 degrees C; thermal management actions may be required.
(Note 2) Input current in excess of maximum may indicate a load/inverter mismatch condition, which can result in
reduced reliability. Please contact ERG technical support.
(Note 3) Provided data is not tested but guaranteed by design.
Application Notes:
1) The minimum distance from high voltage areas of the inverter to any conductive material should be .12
inches per kilovolt of starting voltage.
2) Mounting hardware to be non-conductive.
3) Open framed inverters should not be used in applications at altitudes over 10,000 feet.
4) ACreturn should be left floating, not grounded.
5) Contact ERG for possible exceptions.
page 2.
DMD42850
Onboard PWM
Unless otherwise noted Vin = 12.00 Volts DC, Ta = 25 oC and unit has been running for 5 minutes.
Characteristic
Symbol
Min
Typ
Max
Units
Frequency
f pwm
-
160
-
HZ
Control Input Bias Current
I cb i a s
-
-
10
uA
Pin Descriptions
+Vin
Input voltage to the inverter. The two pins should be connected for optimum reliability and efficiency.
GND
Inverter ground. The four pins should be connected for optimum reliability and efficiency.
Control
Analog voltage input to the onboard pulse width modulator. Decreasing this voltage increases the ON
time of the onboard PWM resulting in increased brightness. The inverter is full ON when this voltage is
near inverter ground.
Enable
Inverter Enable. Pull this pin low to disable inverter operation. This pin must be high to enable the
inverter. The onboard PWM is always utilized.
Application information
The DMD series of inverters is designed to power up to four cold cathode fluorescent lamps. An external analog
control interfaces with an onboard pulse width modulator to provide dimming control. The DMD inverter can reliably
dim to less than 5% duty cycle.
External shutdown of the inverter is accomplished using the Enable pin. Pulling this pin low (below Vthoff) disables
the inverter. Enabling the inverter is accomplished by pulling this pin high (above Vthon).
If analog voltage dimming is required, the analog voltage is applied to the Control pin. Figure 1 shows how to
connect the inverter for onboard PWM operation. Graph 1 shows the relationship of PWM duty cycle to input control
voltage.
If an external PWM is used, simply connect the Enable pin to the PWM source and connect the Control pin to inverter
ground. If the onboard PWM is used, connect the analog voltage to the Control pin.
page 3.
DMD42850
Control Voltage vs. Duty Cycle
100%
Duty Cycle (%)
80%
60%
40%
20%
0%
0
1
2
3
4
5
Control Voltage (V)
Graph 1
Typical Application
+12V
J4
J5
J2
J3
Lamp 3
+5V
Lamp 4
Control
0V = Full ON
5V = Full OFF
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Figure 1
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1
Endicott Research Group, Inc. (ERG) reserves the right to make changes in circuit design and/or
specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets
are current before placing orders. Information furnished by ERG is believed to be accurate and
reliable. However, no responsibility is assumed by ERG for its use.
page 4.